# if 0
#include <boost/asio.hpp>
#include <boost/thread.hpp>
#include <iostream>
void handler1(const boost::system::error_code &ec)
{
std::cout << "5 s." << std::endl;
}
void handler2(const boost::system::error_code &ec)
{
std::cout << "5 s." << std::endl;
}
boost::asio::io_service io_service;
void run()
{
io_service.run();
}
/*
两个线程调用run运行同一个服务，当第一服务在阻塞时，可以再第二个线程里面执行
但这样会使得使用std::cout混乱，开线程要注意，开过多的线程是没有意义的
*/
int main()
{
boost::asio::deadline_timer timer1(io_service, boost::posix_time::seconds(5));
timer1.async_wait(handler1);
boost::asio::deadline_timer timer2(io_service, boost::posix_time::seconds(5));
timer2.async_wait(handler2);
boost::thread thread1(run);
boost::thread thread2(run);
thread1.join();
thread2.join();
}
#endif
#if 0
#include <boost/asio.hpp>
#include <boost/thread.hpp>
#include <iostream>
void handler1(const boost::system::error_code &ec)
{
std::cout << "5 s." << std::endl;
}
void handler2(const boost::system::error_code &ec)
{
std::cout << "5 s." << std::endl;
}
boost::asio::io_service io_service1;
boost::asio::io_service io_service2;
void run1()
{
io_service1.run();
}
void run2()
{
io_service2.run();
}
/*
第二种方法不是多个线程运行同一个服务，而是创建多个服务，每个服务用同一个线程，如果线程数与内核数相同，在一个核上面不回出现竞争现象
*/
int main()
{
boost::asio::deadline_timer timer1(io_service1, boost::posix_time::seconds(5));
timer1.async_wait(handler1);
boost::asio::deadline_timer timer2(io_service2, boost::posix_time::seconds(5));
timer2.async_wait(handler2);
boost::thread thread1(run1);
boost::thread thread2(run2);
thread1.join();
thread2.join();
}
#endif
//简单客户端请求
#if 0
#include <boost/asio.hpp>
#include <boost/array.hpp>
#include <iostream>
#include <string>
boost::asio::io_service io_service;
boost::asio::ip::tcp::resolver resolver(io_service);
boost::asio::ip::tcp::socket sock(io_service);
boost::array<char, 4096> buffer;
/**
*@brief 读回调，当读完时read_handler内部产生错误，不回循环调用了
*/
void read_handler(const boost::system::error_code& ec, std::size_t bytes_transferred)
{
if (!ec)
{
std::cout << std::string(buffer.data(), bytes_transferred) << std::endl;
//必须的，因为可能包没接完，和read_handler交替运行
sock.async_read_some(boost::asio::buffer(buffer), read_handler);
}
}
void connect_handler(const boost::system::error_code& ec)
{
if (!ec)
{
//发送http请求，
boost::asio::write(sock, boost::asio::buffer("GET / HTTP 1.1\r\nHost: highscore.de\r\n\r\n"));
//启动数据的接收,接收数据保存在buffer中，回调read_handler
sock.async_read_some(boost::asio::buffer(buffer), read_handler);
}
}
/**
*@brief 域名解析回调
*@param it 解析后地址
*/
void resolver_handler(const boost::system::error_code& ec, boost::asio::ip::tcp::resolver::iterator it)
{
if (!ec)
{
//访问IO对象sock，建立连接
sock.async_connect(*it, connect_handler);
}
}
int main()
{
boost::asio::ip::tcp::resolver::query query("www.highscore.de", "80");//新建一个查询，域名为...,端口为80
resolver.async_resolve(query, resolver_handler);//解析域名为ip
io_service.run();//将控制权交给操作系统进行异步操作
getchar();
}
#endif
//简单的服务器接收例子
#if 0
#include <boost/asio.hpp>
#include <string>
boost::asio::io_service io_service;
//接收端口配置，从80端口等待v4类型的ip
boost::asio::ip::tcp::endpoint endpoint(boost::asio::ip::tcp::v4(), 80);
boost::asio::ip::tcp::acceptor acceptor(io_service, endpoint);
boost::asio::ip::tcp::socket sock(io_service);
std::string data = "HTTP/1.1 200 OK\r\nContent-Length: 13\r\n\r\nHello, world!";
void write_handler(const boost::system::error_code& ec, std::size_t bytes_transferred)
{
}
void accept_handler(const boost::system::error_code& ec)
{
if (!ec)
{
//async_write_some函数也能发送数据，但这个函数只要发送一个字节就会回调函数，
//因为将整个数据发送完毕异步操作才算完毕，async_write函数在发送完毕调用write_handler
//这个和libevent机制差不多
boost::asio::async_write(sock, boost::asio::buffer(data), write_handler);
}
}
int main()
{
acceptor.listen();//监听，将接收器配置成接收状态
acceptor.async_accept(sock, accept_handler);//等待接收
io_service.run();
}
#endif
